SU983501A1 - Method of material extension testing - Google Patents

Description

(54) METHOD OF TESTING MATERIALS FOR STRETCHING

one

The invention relates to a test technique, namely, to methods for testing materials for stretching.

The method of testing materials for stretching is known, which means that the test device loads the force of the eleventh force exceeding the force of destruction of the specimen of the material, then the test piece is loaded in the same test device and its strength is determined 1.

However, the method has insufficient accuracy in determining strength.

The purpose of the invention is to increase the accuracy of the 15

This goal is achieved by the fact that, during the loading of an inextensible element, a stress diagram of -20 deflection test device is recorded and subtracted from the stress-strain diagram, which is recorded when the specimen is tested.

The drawing shows a device for implementing the method.

The device contains loading elements in the form of a heavy rod 1 and a supporting pipe 2, placed, for example, in a cryostat 3, a dynamometer 4. and a deformometer 5, electrically connected with a recording device 6, such as a self-amplifier. The deformometer 5 is electrically connected to the electronic unit 7, which in turn is electrically connected to the recording device 6. The dynamometer 4 is electrically connected to the recording device 6 both directly and through the electronic unit 7.

The method is implemented as follows.

A non-expandable element (not shown) is placed between the load element of the test device.

Claims (1)

The non-expandable element is loaded with an increasing force, while the non-expanding element is not deformed, but with the dynamometer 4, the deformometer 5, 3 & In the process of loading, the electronic unit 7 in the 6-pemciw circuit is subjected to a usnle-deformation diagram of the test device, which characterizes the rigidity of the test device. The tests in the same test device will stir the sample 8 test. material and load the sample 8 with a growing force under the same conditions as the non-expanding element. The electrical signal removed from the dynamometer 4 is introduced into the recording device 6 to determine the load. At the same time, the same electrical signal from the dynamometer 4 is inputted into the electronic unit 7, in which it is subtracted from the electric signal supplied to the electronic unit 7 from the deformometer 5. At the same time, the recording device 6 records not the total strain diagram sample 8 and the test device, and the force diagram is the deformation of the specimen itself 8. The invention improves the accuracy of the diagram for the force-sample deformation by eliminating and IS1 pytatelnogo device on the test results. The invention of the method of testing materials for dilution, which consists in loading an inexpressible element with a force exceeding the force of destruction of a sample of a material in a test device, then loading the test sample in the same test device and determining its strength , in order to increase the accuracy of determining the strength of the path & l of accounting for the deformation of the test device, in the process of loading an inextensible element a force-deformation diagram is recorded oystva and subtract it from the force diagrams - strain, which were recorded at the sample test. Sources of information taken into account in the examination 1. USSR author's certificate according to application N9 2888316 / 25-28, cl. G 01 N C / PA, 1980 (prototype).